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geo-point-in-polygon
x402
geo-point-in-polygon is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).
Determines whether a geographic coordinate (lat/lon) lies inside or outside a given polygon using ray-casting with planar approximation.
Price / call$0.001
Success—
StatusUnknown
How this service works
Ray-casting point-in-polygon test (planar approximation - fine for city/region-scale polygons).
Output
A boolean result indicating whether the provided geographic point (lat/lon) is inside or outside the specified polygon, computed via ray-casting with planar approximation suitable for city- or region-scale polygons.
Example use cases
Delivery zone eligibility check
“I need to know if the customer's location at lat 51.5074, lon -0.1278 falls inside my delivery zone polygon, which has these corners: (51.49, -0.15), (51.49, -0.10), (51.52, -0.10), (51.52, -0.15). Are they eligible for delivery?”
Geofence alert for fleet tracking
“Check if this truck's current GPS position — latitude 37.7749, longitude -122.4194 — is still inside our permitted operating zone defined by the polygon: (37.76, -122.44), (37.76, -122.40), (37.79, -122.40), (37.79, -122.44).”
Neighborhood boundary classification
“Does the coordinate lat 48.8566, lon 2.3522 fall within the polygon representing the 1st arrondissement of Paris? The polygon vertices are: (48.849, 2.340), (48.849, 2.365), (48.863, 2.365), (48.863, 2.340).”
Technical details
Endpoint
GEThttps://x402.agentindex.world/geo/point-in-polygon?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call geospatial containment test without maintaining a geospatial database or library. Ideal for city- or region-scale polygons where planar approximation is acceptable. Best suited for serverless agent workflows needing on-demand geofencing without API key management.
Side effects
- Polygon has fewer than 3 vertices — minItems:3 constraint violation
- Invalid latitude (outside -90 to 90) or longitude (outside -180 to 180)
- Planar approximation may produce inaccurate results for very large or pole-spanning polygons
- Malformed JSON payload for point or polygon objects
- Missing required lat/lon fields in point or polygon vertices
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| point | object | |
| polygon | array |
Output
Schema · Response
{
"type": "json",
"example": {
"inside": true
}
}Tags
x402
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